--- /dev/null
+#!/bin/bash
+set -e
+
+variant='minbase'
+include='iproute,iputils-ping'
+arch='amd64' # intentionally undocumented for now
+skipDetection=
+strictDebootstrap=
+justTar=
+
+usage() {
+ echo >&2
+
+ echo >&2 "usage: $0 [options] repo suite [mirror]"
+
+ echo >&2
+ echo >&2 'options: (not recommended)'
+ echo >&2 " -p set an http_proxy for debootstrap"
+ echo >&2 " -v $variant # change default debootstrap variant"
+ echo >&2 " -i $include # change default package includes"
+ echo >&2 " -d # strict debootstrap (do not apply any docker-specific tweaks)"
+ echo >&2 " -s # skip version detection and tagging (ie, precise also tagged as 12.04)"
+ echo >&2 " # note that this will also skip adding universe and/or security/updates to sources.list"
+ echo >&2 " -t # just create a tarball, especially for dockerbrew (uses repo as tarball name)"
+
+ echo >&2
+ echo >&2 " ie: $0 username/debian squeeze"
+ echo >&2 " $0 username/debian squeeze http://ftp.uk.debian.org/debian/"
+
+ echo >&2
+ echo >&2 " ie: $0 username/ubuntu precise"
+ echo >&2 " $0 username/ubuntu precise http://mirrors.melbourne.co.uk/ubuntu/"
+
+ echo >&2
+ echo >&2 " ie: $0 -t precise.tar.bz2 precise"
+ echo >&2 " $0 -t wheezy.tgz wheezy"
+ echo >&2 " $0 -t wheezy-uk.tar.xz wheezy http://ftp.uk.debian.org/debian/"
+
+ echo >&2
+}
+
+# these should match the names found at http://www.debian.org/releases/
+debianStable=wheezy
+debianUnstable=sid
+# this should match the name found at http://releases.ubuntu.com/
+ubuntuLatestLTS=precise
+
+while getopts v:i:a:p:dst name; do
+ case "$name" in
+ p)
+ http_proxy="$OPTARG"
+ ;;
+ v)
+ variant="$OPTARG"
+ ;;
+ i)
+ include="$OPTARG"
+ ;;
+ a)
+ arch="$OPTARG"
+ ;;
+ d)
+ strictDebootstrap=1
+ ;;
+ s)
+ skipDetection=1
+ ;;
+ t)
+ justTar=1
+ ;;
+ ?)
+ usage
+ exit 0
+ ;;
+ esac
+done
+shift $(($OPTIND - 1))
+
+repo="$1"
+suite="$2"
+mirror="${3:-}" # stick to the default debootstrap mirror if one is not provided
+
+if [ ! "$repo" ] || [ ! "$suite" ]; then
+ usage
+ exit 1
+fi
+
+# some rudimentary detection for whether we need to "sudo" our docker calls
+docker=''
+if docker version > /dev/null 2>&1; then
+ docker='docker'
+elif sudo docker version > /dev/null 2>&1; then
+ docker='sudo docker'
+elif command -v docker > /dev/null 2>&1; then
+ docker='docker'
+else
+ echo >&2 "warning: either docker isn't installed, or your current user cannot run it;"
+ echo >&2 " this script is not likely to work as expected"
+ sleep 3
+ docker='docker' # give us a command-not-found later
+fi
+
+# make sure we have an absolute path to our final tarball so we can still reference it properly after we change directory
+if [ "$justTar" ]; then
+ if [ ! -d "$(dirname "$repo")" ]; then
+ echo >&2 "error: $(dirname "$repo") does not exist"
+ exit 1
+ fi
+ repo="$(cd "$(dirname "$repo")" && pwd -P)/$(basename "$repo")"
+fi
+
+# will be filled in later, if [ -z "$skipDetection" ]
+lsbDist=''
+
+target="/tmp/docker-rootfs-debootstrap-$suite-$$-$RANDOM"
+
+cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
+returnTo="$(pwd -P)"
+
+set -x
+
+# bootstrap
+mkdir -p "$target"
+sudo http_proxy=$http_proxy debootstrap --verbose --variant="$variant" --include="$include" --arch="$arch" "$suite" "$target" "$mirror"
+
+cd "$target"
+
+if [ -z "$strictDebootstrap" ]; then
+ # prevent init scripts from running during install/update
+ # policy-rc.d (for most scripts)
+ echo $'#!/bin/sh\nexit 101' | sudo tee usr/sbin/policy-rc.d > /dev/null
+ sudo chmod +x usr/sbin/policy-rc.d
+ # initctl (for some pesky upstart scripts)
+ sudo chroot . dpkg-divert --local --rename --add /sbin/initctl
+ sudo ln -sf /bin/true sbin/initctl
+ # see https://github.com/dotcloud/docker/issues/446#issuecomment-16953173
+
+ # shrink the image, since apt makes us fat (wheezy: ~157.5MB vs ~120MB)
+ sudo chroot . apt-get clean
+
+ # while we're at it, apt is unnecessarily slow inside containers
+ # this forces dpkg not to call sync() after package extraction and speeds up install
+ # the benefit is huge on spinning disks, and the penalty is nonexistent on SSD or decent server virtualization
+ echo 'force-unsafe-io' | sudo tee etc/dpkg/dpkg.cfg.d/02apt-speedup > /dev/null
+ # we want to effectively run "apt-get clean" after every install to keep images small
+ echo 'DPkg::Post-Invoke {"/bin/rm -f /var/cache/apt/archives/*.deb || true";};' | sudo tee etc/apt/apt.conf.d/no-cache > /dev/null
+
+ # helpful undo lines for each the above tweaks (for lack of a better home to keep track of them):
+ # rm /usr/sbin/policy-rc.d
+ # rm /sbin/initctl; dpkg-divert --rename --remove /sbin/initctl
+ # rm /etc/dpkg/dpkg.cfg.d/02apt-speedup
+ # rm /etc/apt/apt.conf.d/no-cache
+
+ if [ -z "$skipDetection" ]; then
+ # see also rudimentary platform detection in hack/install.sh
+ lsbDist=''
+ if [ -r etc/lsb-release ]; then
+ lsbDist="$(. etc/lsb-release && echo "$DISTRIB_ID")"
+ fi
+ if [ -z "$lsbDist" ] && [ -r etc/debian_version ]; then
+ lsbDist='Debian'
+ fi
+
+ case "$lsbDist" in
+ Debian)
+ # add the updates and security repositories
+ if [ "$suite" != "$debianUnstable" -a "$suite" != 'unstable' ]; then
+ # ${suite}-updates only applies to non-unstable
+ sudo sed -i "p; s/ $suite main$/ ${suite}-updates main/" etc/apt/sources.list
+
+ # same for security updates
+ echo "deb http://security.debian.org/ $suite/updates main" | sudo tee -a etc/apt/sources.list > /dev/null
+ fi
+ ;;
+ Ubuntu)
+ # add the universe, updates, and security repositories
+ sudo sed -i "
+ s/ $suite main$/ $suite main universe/; p;
+ s/ $suite main/ ${suite}-updates main/; p;
+ s/ $suite-updates main/ ${suite}-security main/
+ " etc/apt/sources.list
+ ;;
+ esac
+ fi
+fi
+
+if [ "$justTar" ]; then
+ # create the tarball file so it has the right permissions (ie, not root)
+ touch "$repo"
+
+ # fill the tarball
+ sudo tar --numeric-owner -caf "$repo" .
+else
+ # create the image (and tag $repo:$suite)
+ sudo tar --numeric-owner -c . | $docker import - $repo $suite
+
+ # test the image
+ $docker run -i -t $repo:$suite echo success
+
+ if [ -z "$skipDetection" ]; then
+ case "$lsbDist" in
+ Debian)
+ if [ "$suite" = "$debianStable" -o "$suite" = 'stable' ] && [ -r etc/debian_version ]; then
+ # tag latest
+ $docker tag $repo:$suite $repo latest
+
+ if [ -r etc/debian_version ]; then
+ # tag the specific debian release version (which is only reasonable to tag on debian stable)
+ ver=$(cat etc/debian_version)
+ $docker tag $repo:$suite $repo $ver
+ fi
+ fi
+ ;;
+ Ubuntu)
+ if [ "$suite" = "$ubuntuLatestLTS" ]; then
+ # tag latest
+ $docker tag $repo:$suite $repo latest
+ fi
+ if [ -r etc/lsb-release ]; then
+ lsbRelease="$(. etc/lsb-release && echo "$DISTRIB_RELEASE")"
+ if [ "$lsbRelease" ]; then
+ # tag specific Ubuntu version number, if available (12.04, etc.)
+ $docker tag $repo:$suite $repo $lsbRelease
+ fi
+ fi
+ ;;
+ esac
+ fi
+fi
+
+# cleanup
+cd "$returnTo"
+sudo rm -rf "$target"